THE PKIDE. 447 



This species of Lamprey closely resembles the Lam pern 

 both in its appearance and habits, and from having a num- 

 ber of external openings placed along the sides of the 

 neck, has been improperly named the nine-eyed eel. It, 

 however, is readily distinguished from the lampern in the 

 two dorsal fins being contiguous, whereas in the lamperns 

 these fins are widely apart. Planer's Lamprey is occasion- 

 ally met with in the Forth, the Teith, and the Allan, be- 

 sides in several other rivers in Scotland. Mr Yarrell has 

 obtained it from a brook in Surrey, and he also received spe- 

 cimens from Lancashire which measured nearly eight inches 

 in length. It appears to be a common fish in the rivers of 

 Sweden, where it spawns in April and May. 



Genus AMMOCCETES. — Seven branchial openings on 

 each side of the neck ; mouth without teeth ; upper lip 

 semicircular, covering only the upper part and sides of the 

 mouth. 



Ammooetes branchiat.is.* — The Pride. 



Description. — From a specimen rather more than two and a half 

 inches in length, and somewhat thicker than a common earth-worm 

 of equal length. The anterior part of the body, as far as the first 

 dorsal fin nearly of equal diameter, from thence gradually tapering 

 to the end of the tail where it terminates in a sharp point. Eyes 

 small, scarcely apparent ; branchial openings seven on each side of 

 the neck, arranged in a row running backwards and slightly down- 

 wards ; orifice of the mouth somewhat of a square form ; upper lip 

 thin and membranous, terminating on each side in a free truncated 

 lobe ; under lip transverse ; ' f mouth without teeth, but furnished 

 with numerous short membranous cirri." Dorsal fins two, not very 

 apparent, the first taking its origin, half-way between the tip of the 

 tail and the end of the snout, and terminating a little in front of the 

 second dorsal ; the length of its base six or seven times greater than 



* Ammoccetex branchialis, Cuv., Yarn, Jen., Flem. Pelromyzon bran- 

 chialis, Linn., Penn. Pride, Sand-Pride, Sand-prey, Mud-Lamprey. 



